The present invention is concerned with a novel process for the preparation of the hydroxybenzothiophene of formula I
1
comprising cyclocarbonylation of a compound of formula II
2
wherein Y is as defined in the specification, followed by saponification. The compound of Formula I is a building block of pharmaceutically active substances, e.g. 5-[4-[2-(5-methyl-2-phenyl-4-oxazolyl)ethoxy]-7-benzothiophenylmethyl]-2,4-thiazolidinedione and the corresponding sodium salt which are from agents useful in the treatment of diabetes.
本发明涉及一种新型制备式I1羟基
苯并噻吩的方法,包括对式II2化合物进行环状羰基化反应,其中Y如规范中所定义,然后进行皂化。式I的化合物是药物活性物质的构建块,例如5-[4-[2-(5-甲基-2-苯基-4-
噁唑基)乙氧基]-7-
苯并噻吩基甲基]-
2,4-噻唑烷二酮及其相应的钠盐,这是治疗糖尿病的有用药剂。